---
title: "Senior Full-Stack JavaScript… at FIRST – Sofia, Bulgaria"
canonical: "https://www.metaintro.com/job/senior-full-stack-javascript-developer-at-first-8c3a0bfd-c1e5-5cb3-97f4-e81fad44f729"
language: "en"
author: "Metaintro"
---

[![FIRST logo](/api/favicon-proxy?url=https%3A%2F%2Fwww.google.com%2Fs2%2Ffavicons%3Fdomain%3Dfirst.bet%26sz%3D128)](/company/first-aa0170da)[FIRST](/company/first-aa0170da)
# Senior Full-Stack JavaScript Developer at FIRST

Department: R&D

**Setup**
: Hybrid

**Location**
: Sofia, Sofia-City

**Type**
: Full-time

**Level**
: senior

**Posted**
: Apr 2, 2026

## Description

FIRST. Best in Sports is hiring a Senior Full-Stack JavaScript Developer to design, develop, and deploy backend services for its microservices-based sportsbook platform. The role focuses on high availability, low latency, scalability, product quality, and challenging problem-solving, using JavaScript/TypeScript, Nest.js, MongoDB, Aerospike, and Pulsar. Candidates need at least three years of Node.js and TypeScript experience, three years of React experience, database and high-load systems experience, and microservices architecture experience. The position offers additional health insurance, food vouchers, a multisport card, paid annual leave, flexible working hours, and other employee benefits.

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